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The valorization of coffee pulp as a source of natural dyes for cotton fibers represents a sustainable alternative to synthetic dyes, addressing both agricultural waste management and environmental concerns in the textile industry. This study investigates the optimization of extraction methods for bioactive compounds from coffee pulp (TUPI - IAC 1669–33 coffee variety), focusing on their application as natural dyes. Three extraction techniques were evaluated: infusion, Soxhlet, and ultrasound, to determine their efficiency in recovering polyphenols, tannins, caffeine, and chlorogenic acid. The results showed that infusion was the most effective method, obtaining the highest concentrations of total polyphenols (0.280 mgGAE/gCP) and hydrolysable tannins (5.991 mgTAE/gCP), as well as the highest amounts of chlorogenic acid (3.841 mgCA/gCP) and caffeine (8.453 mgCF/gCP). Ultrasound extraction showed superior performance in extracting condensed tannins (1.594 mgCya/gCP), while Soxhlet extraction produced the lowest concentrations of all compounds. The dyeing performance of the extracts was evaluated on cotton fabrics, where extracts obtained by infusion produced the most intense and wash-resistant results, especially when a mordant (tannic acid) was used. Colorfastness tests revealed excellent wash resistance (4–5 on the Gray Scale) in most samples, with minimal colour transfer. These findings highlight the potential of coffee pulp as a sustainable source of natural dyes, offering a viable solution to reduce agroindustrial waste and promote eco-friendly practices in the textile industry.

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Optimization of Coffee Pulp Compound Extraction as a Dye for Cotton Fibers

  • 会议论文

  • 发表日期：

    2026年

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  • Gisbert-Payá Jaime,
  • Belda-Anaya Raquel,
  • Minguez-García David,
  • Vidurrizaga Hassinger Corina

摘要

The valorization of coffee pulp as a source of natural dyes for cotton fibers represents a sustainable alternative to synthetic dyes, addressing both agricultural waste management and environmental concerns in the textile industry. This study investigates the optimization of extraction methods for bioactive compounds from coffee pulp (TUPI - IAC 1669–33 coffee variety), focusing on their application as natural dyes. Three extraction techniques were evaluated: infusion, Soxhlet, and ultrasound, to determine their efficiency in recovering polyphenols, tannins, caffeine, and chlorogenic acid. The results showed that infusion was the most effective method, obtaining the highest concentrations of total polyphenols (0.280 mgGAE/gCP) and hydrolysable tannins (5.991 mgTAE/gCP), as well as the highest amounts of chlorogenic acid (3.841 mgCA/gCP) and caffeine (8.453 mgCF/gCP). Ultrasound extraction showed superior performance in extracting condensed tannins (1.594 mgCya/gCP), while Soxhlet extraction produced the lowest concentrations of all compounds. The dyeing performance of the extracts was evaluated on cotton fabrics, where extracts obtained by infusion produced the most intense and wash-resistant results, especially when a mordant (tannic acid) was used. Colorfastness tests revealed excellent wash resistance (4–5 on the Gray Scale) in most samples, with minimal colour transfer. These findings highlight the potential of coffee pulp as a sustainable source of natural dyes, offering a viable solution to reduce agroindustrial waste and promote eco-friendly practices in the textile industry.